#include <bits/stdc++.h>
using namespace std;

int main(){

    string a,b;
    while (cin>>a>>b){
        int min_pos=1e9,min_value=1e9;
        for (int i=0;i<a.length();i++){
            if (a[i]<min_value){
                min_pos=i;
                min_value=a[i];
            }
        }
        for (int i=0;i<=min_pos;i++){
            cout<<a[i];
        }
        cout<<b;
        for (int i=min_pos+1;i<a.length();i++){
            cout<<a[i];
        }
        cout<<endl;
    }
    return 0;
}